Electrochemical Characterization and Rate Capability Analysis of Carbon-Based Supercapacitor Electrodes

Abstract While the sense of the real existence of renewable energy rises and falls more into its status, energy storage techniques and materials attain a sort of mundane perception of great importance. This was the root cause of another bipartite technical study trying to research various carbon-based materials as supercapacitor electrodes by asking questions and giving answers when the compositions of nanoporous carbon were different. A battery of 16 tests got collected, from which were allocated two cyclic voltammetry measures and 14 galvanostatic runs with various current densities. About every six hours in the course of the experiments, we completed ~129,892 data entries. One discharge time lasted between 1.14 and 64.63 minutes, allowing us to examine the merits over a range of power and energy conditions. The depicted current responses in cyclic voltammetry from -29.0 mA to +19.3 mA suggested mixed cold double layer and pseudo-capacitance responses; indeed, voltage was invariably held at slightly less than 1.0 V as is intended to be the most effective window into the voltage. Furthermore, it was observed that the electrode could maintain up to 78.4% of the capacitance at the highest discharge rates, an amazingly high value compared to the rather low levels of AC electrodes. The coulombic efficiency was retained above 93% over all tests, a value that underlines reversibility efficacy. The electrode reached a maximum energy of 22.5 Wh/kg and a maximum power density at 936.8 W/kg. This work presents a systematic procedure for performance evaluation of supercapacitor electrodes, with these particular carbon batches functioning as the benchmarks.